docstr: Return an alias, or None if no alias by that name exists.
docstr_tok: ["Return","an","alias",",","or","None","if","no","alias","by","that","name","exists","."]
code: def get_alias(self, name):
      """Return an alias, or None if no alias by that name exists."""
      aname = self.linemagics.get(name, None)
      return aname if isinstance(aname, Alias) else None
  
imports: import os
  import re
  import sys
  from traitlets.config.configurable import Configurable
  from .error import UsageError
  from traitlets import List, Instance
  from logging import error
label_desc: Use image node_id 6 for calling the AliasManager obj's underlying member method code with example usage: obj.get_alias(name) and returns: unknown